Performance Analysis of Variable Speed Pump Systems by Applying Bernoulli Equation

• Main Authors: Chien-Cheng Shih, 施建成
• Other Authors: 柯明村
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/tn778e

碩士 === 國立臺北科技大學 === 能源與冷凍空調工程系碩士班 === 102 === The energy consumed by air conditioning system for general commercial building is about 40~50% of the total energy consumption, therefore, there is still a lot of room for energy saving on air conditioning system. Popular energy saving method includes using variable air volume for fan system and using variable water volume for pump system. The system speed will adjust air and water volume according to the loading to optimize energy consumption. Fan and pump of air conditioning system are both in the field of fluid mechanics where fan affinity laws and pump affinity laws are applicable. There is a cubic relationship between the shaft horsepower in theoretical affinity law and the shaft horsepower in variable air volume and variable water volume. However, in reality, the difference between real shaft horsepower and theoretical shaft horsepower is significant. This study will simulate and calculate the energy consumption at one operating point in an air conditioning variable speed pump piping system and come up with the energy consumption in all operating points in the system by using Bernoulli''s equation. The result will be compared with the theoretical energy consumption calculated by using pump affinity laws and derive a formula for the energy consumption of air conditioning variable speed pump piping system.